omit on older version #1789

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (2.7)	1m 48s
test (3.1)	1m 46s
test (3.4)	1m 45s
test (3.0)	2m 2s
test (3.3)	1m 43s
test (3.2)	1m 59s
test (debug)	6m 17s
test (head)	1m 49s
	19m 14s

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